Move header helpers from module/header/ to module/helpers/

src/module/bm/header.rs

@@ -1,4 +1,4 @@
-use module::header as headerhelpers;
+use module::helpers::header as headerhelpers;
 use storage::file::FileHeaderData as FHD;
 use storage::file::FileHeaderSpec as FHS;
 

src/module/helpers/mod.rs

@@ -0,0 +1 @@
+pub mod header;

src/module/mod.rs

@@ -10,7 +10,7 @@ use runtime::Runtime;
 use storage::backend::StorageBackend;
 
 pub mod bm;
-pub mod header;
+pub mod helpers;
 
 #[derive(Debug)]
 pub struct ModuleError {